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Residential Kitchen Ventilation - a Guide for the Specifying Engineer

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Residential Kitchen Ventilation - a Guide for the Specifying Engineer AN-92-16-1 RESIDENTIAL KITCHEN VENTILATION - A GUIDE FOR THE SPECIFYING ENGINEER D.W. Wolbrink J.R. Sarnosky, P.E. Member ASHRAE ABSTRACT The hood provided an inverted sump to capture the convective flow and the fan extracted the captured air. It r The evolution of residential kitchen ventilation is actually worked well and revolutionized residential kitchen examined a/Id the importance of kitchen range hoods in ventilation. today's ventilation systems is reviewed as an aid to the Today's powered residential range hood came into specifying engineer. Home cooking produces liquid a/Id being when engineers unitized the hood, putting the fan solid particles, odors, airborne moisture, heat, and inside the hood at the factory, so their company could sell sometimes gas combustion products. How the residential one product where before they had sold two. With the range hood handles these problems is revealed, and the addition of an effective light for the cooking surface, the results of various testing programs are given. The proper present standard configuration of the product appeared. application of range hoods relative to sizing, room Ductless hoods, althoughnotventilatingdevices, must location, a/Id proper ductwork is discussed. 1he rating be mentioned as part of kitchen ventilation history. They methods a/Id standards for hoods are explained and appeared on the scene just after the Nautilus submarine related to real life. The issues of range hood noise and traveled under tlie polar ice cap in the 1950s. There was energy conservation are reviewed a/Id answers are great public awareness of the use of activated carbon provided on how to ha/Idle these issues. Current standards (charcoal) as an adsorbent for maintaining the quality of a/Id codes dealing with kitchen ventilation are reviewed. the air on board the submarine. The time was ripe for the The future of kitchen ventilation in home construction is introduction of the "charcoal" range hood. Today those predicted and discusse~ / hoods are sold in considerable volume, even though their contribution to improved residential air quality is not INTRODUCTION exciting. In fact, manufacturers of ductless hoods make no claims for their performance as ventilating equipment. Cooking generates pollution, so the history of kitchen ventilation goes back to early times. History can provide Kitchen Ventilation Is Important insights into the mechanics of the ventilation process. By to Residential Air Quality quantifying the parameters associated with cooking and ventilation, problems will be solved easily and effectively. It is important now for ASHRAE engineers to appreciate the importance of kitchen ventilation in the History of Kitchen Ventilation total scheme of residential indoor air quality. Residential air quality is becoming increasingly important to the Kitchen ventilation has always been important to public. They are demanding better ventilation in their comfort and health, but people have only recently become homes, and specifying engineers need to be proficient in m~ch more aware of it. Even in the stereotyped tepee of designing systems that will meet their expectations. the early Native Americans, there was a flap in the top to How will ASHRAE meet this challenge? It is already let the smoke out. Early American settlers used fireplaces doing so. It started with a new interest in residential for cooking, where the convective currents flowed up the energy conservation. ASHRAE responded appropriately chimney and makeup air ..came in through the cracks in by splitting ASHRAE Standard 90, Energy Conservation the structure. in New Building Design, into 90.1 (larger buildings) and Many of us remember when open windows provided 90.2 (residential). That was a landmark of sorts, a the needed ventilation .. They were replaced by through­ significant venture by ASHRAE into the residential field. the-wall fans, often equipped with a pull chain; even those As with energy, it is now appropriate to emphasire the have been around for a couple of generations. residential aspects of ventilation. ASHRAE Standard 62, In the 1950s the first version of an effective working Ventilation for Acceptable Indoor Air Quality, covers kitchen range hood appeared. It was a separate metal both commercial and, to some degree, residential ap­ hood, mounted over the cooking range. The traditional plications, but residential information is scanty and is fan was installed through the wan just below the hood. wri~ten as an offshoot of commercial. It is important that David W. Wolbrink is vice-president of engineering and Joseph R. Sarnosky is a project engineer at Broan Manufacturing Co., Inc., Hartford, WI. THIS PREPRINT IS FOR DISCUSSION PURPOSES ONLY, FOR INCLUSION IN ASHRAE TRANSACTIONS 1992, V. 98, Pt. 1. Not to be reprinted in whole or in part without written permission of the American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc., 179) Tullio Circle •. NE, Atlanta, GA 30329. Opinions, findings, conclusions, or recommendations expreBBed in this paper are those of the 11uthor(sl 11nd do not necessarily reflectthe views of ASHRAE. Written questions and comments regarding this paper should be received at ASHRAE no later than Feb. 7, 1992. residential ventilation should gain its own coverage indoor air quality, and today's ho118e8 don't leak enough because the residential concerns are unique. to cover up problems. Specifying engineers must and will With improved energy performance of residential become involved. building construction, it has become apparent that residen­ This paper will explain how to be successful when tial ventilation has two distinct parts: specifying intermittent kitchen ventilation and why, especially for the engineer, the necessary recommen­ 1. continuous ventilation, directoo toward those pol­ dations are made. lutants that are produced continuously, including such sources as respiration, perspiration, and emissions from building materials, and FACTORS RELATED TO KITCHEN VENTILATION 2. intermittent ventilation, directed toward those pol­ lutants that are produced intermittently, including To deal effectively with kitchen ventilntion, 11 knowl­ those produced by showering, cooking, bathroom edge of cooking contaminants is essential. Then the use, and smoking. performance of hoods against those contaminants can be evaluated and a method of quantitatively measuring that Why are there two parts? First, the intermittent performance can be developed. pollutants must be controlled as part of source mitigation, the first step toward indoor air quality. If not mitigated, Contaminants in the Kitchen the contaminants can be harmful, either causing damage or introducing harmful pollutants through recirculation, so What is the character of kitchen contamination? First, intermittent ventilation is required in the kitchen if the contamination is produced at a high level of con­ continuous ventilation is to work satisfactorily. centration over a short time. Second, there are a variety Second, continuous ventilation must be at a relatively of contaminants involved, including particulate matter, low rate because of energy costs, but that low rate is moisture, heat, odors, and gases, and this variety of inadequate to control intermittent pollutants because of the contaminants can be produced in a variety of combina­ high generation rates. Cain et al. (1979) found that some tions. contaminants (tobacco smoke) are not controlled by Particles can be formed in several ways. Both solid ventilation rates of a fraction of an air change per hour. and liquid particles are generated in cooking. The solid It is not practical to control high concentrations of particles are usually a result of an error in cooking that intermittent pollutants with continuous ventilation because causes the food to bum, generating carbonaceous par­ economics and comfort do not permit the necessary high ticles. Vegetables in particular are of a cellulosic nature, rate of ventilation. and they readily form these solid particles when burned. History helps emphasize the distinction between the These "burning" incidents are infrequent but still must be character of continuous and intermittent ventilation. The kept in mind because particles are produced. continuous ventilation of pre-oil-embargo houses was The liquid particles formed are the most important. provided by natural infiltration, usually found to be They are produced in two distinct size ranges. The large between 0.5 and 2.0 air changes per hour (ach). Intermit­ liquid particles form through minor explosions within the tent ventilation in those same houses was usually provided cooking vessel, and they are visible as they move through by an openable window in the kitchen and bath (with the air and spatter on the surrounding surfaces. The mechanical ventilation as an acceptable alternative in most explosions occur when water contained within the food is codes and standards). introduced into hot liquid grease or oil. The high tempera­ Today continuous ventilation is sometimes provided ture of the oil causes the water contained in the food to by "whole house" systems with a ventilation rate of 0.3 flash over explosively into steam, spattering the liquid to 0.5 air changes per hour. Intermittent ventilation in grease. The size of the particles formed this way ensures these houses is provided through .\citchen range hoods and that most will quickly fall back onto the adjacent surfaces bathroom exhaust fans. If the high concentrations of due to gravitational forces,
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